86 Scientific Intelligence. 



in large print as may seem desirable." This is unquestionably 

 true from the theoretical standpoint, but we have found by 

 experience that, in general, much culling out of paragraphs is not 

 conducive to the best results on the part of the student. 



The processes of the differential and integral calculus are used 

 only in the small-print paragraphs and the notation of infinitesi- 

 mals occurs very infrequently in the large-type articles. Never- 

 theless, several useful formulae, which in their less rigorous, 

 algebraic clothing are very useful in numerical examples, occur 

 only in the small-print paragraphs in conjunction with the more 

 rigorous, calculus expressions for the same laws. 



The problems are not numerous and are grouped at the ends 

 only of the chief divisions of the entire subject to w^hich they 

 appertain. The percentage of rather poorly drawn, shaded 

 figures is appreciably greater in this volume than is usually the 

 case with recent books of college grade. • h. s. u. 



II. Geology. 



1. Publications of the United States Geological Survey, 

 George Otis Smith, Director. — Recent publications of the IT. !S. 

 Geological Survey are noted in the following list (continued from 

 p. 402 of vol. xxvi) : 



Topographic Atlas. — Thirty-five sheets. 



Folio No. 161. Franklin Furnace Folio, New Jersey. Descrip- 

 tion of the Franklin Furnace Quadrangle ; by A. C. Spencer, H. 

 B. KfJMMEL, J. E. Wolff, R. D. Salisbury, and Charles 

 Palache. Pp. 27, with 6 maps, columnar sections, 15 figures. 



Bulletins. — No. 347. The Ketchikan and Wrangell Mining 

 Districts, Alaska; by Fred Eugene Wright and Charles 

 Wtll Wright. Pp. 210 ; 12 plates, 23 figures, 3 maps in pocket. 



No. 349. Economic Geology of the Kenova Quadrangle, Ken- 

 tucky, Ohio, and West Virginia ; by William Clifton Phalen. 

 Pp. 158, 6 plates, 21 figures. 



No. 351. The Clays of Arkansas ; by John C. Branner. 

 Pp. 247 ; 1 plate, 20 figures, 1 map in pocket. 



No. 352. Geologic Reconnaissance of a Part of Western 

 Arizona ; by Willis T. Lee. With notes on the Igneous Rocks 

 of Western Arizona; by Albert Johannsen. Pp. 96 ; 11 plates, 

 16 figures. 



No. 355. The Magnesite Deposits of California ; by Frank 

 L. Hess. Pp. 67, 12 plates, 4 figures. 



No. 357. Preliminary Report of the Coalinga Oil District, 

 Fresno and Kings Counties, California ; by Ralph Arnold and 

 Robert Anderson. Pp. 142, 2 plates, 1 figure. 



No. 362. Mine Sampling and Chemical Analyses of Coals 

 tested by the United States Fuel-testing Plant, Norfolk, Va., in 

 1907 ; by John Shober Burrows. Pp. 23. 



